Set same toolchain in lib module as in main module

lib/build.gradle.kts

@@ -7,8 +7,10 @@ java {
     sourceCompatibility = JavaVersion.VERSION_21
     targetCompatibility = JavaVersion.VERSION_21
 
-    toolchain {
-        languageVersion.set(JavaLanguageVersion.of(21))
+    if (!JavaVersion.current().isCompatibleWith(targetCompatibility)) {
+        toolchain {
+            languageVersion.set(JavaLanguageVersion.of(targetCompatibility.majorVersion))
+        }
     }
 }
 

lib/src/main/java/org/asamk/signal/manager/util/Utils.java

@@ -160,9 +160,10 @@ public class Utils {
         return NetworkResultUtil.toBasicLegacy(response);
     }
 
+    @SuppressWarnings("unchecked")
     public static <T, E extends BadRequestError> T handleResponseException(final RequestResult<T, E> result) throws IOException {
-        if (result instanceof RequestResult.Success) {
-            return ((RequestResult.Success<T>) result).getResult();
+        if (result instanceof RequestResult.Success<?> success) {
+            return ((RequestResult.Success<T>) success).getResult();
         } else if (result instanceof RequestResult.ApplicationError e) {
             final var cause = e.getCause();
             switch (cause) {